A. gigas may refer to:
Plants Amorphophallus gigas, a species of the genus Amorphophallus
Animals Acerentulus gigas Aethilla gigas, provisionally accepted name; see Aethilla (butterfly) Agdistis gigas, provisionally accepted name for a moth species (Agdistis manicata) Agylla gigas, provisionally accepted name Alveopora gigas, see IUCN Red List vulnerable species (Animalia) Anopheles gigas Apagomerina gigas Arapaima gigas, arapaima, pirarucu, or paiche, a freshwater fish Archispirostreptus gigas (synonym), the giant African millipede Argyropelecus gigas, giant hatchetfish or greater silver hatchetfish Arius gigas Athletes gigas, provisionally accepted name; see Athletes (moth) Avelia gigas, a karyorelict ciliate in genus Avelia Ancyloscelis gigas, a Southern Brazilian bee
See also Gigas (disambiguation)